AM_Norbergite_1 Formula: (Mg2.979 Fe.021) (Si.985 B.015) H.454 O4.462 F1.538 Name: Norbergite Unit cell: 4.71 10.279 8.807 90.0 90.0 90.0 , V=426.38 Space group: PBNM (62)

Camara F , The Canadian Mineralogist , 35 (1997) p.1523-1530, New data on the structure of norbergite: location of hydrogen, by X-ray diffraction, Sample: HV43 N4